This paper reports on the use of vignettes to study drug injectors' pr
eparedness to share injecting equipment. Separate vignettes referring
to borrowing and passing on injecting equipment have been submitted to
505 injecting drug users in Glasgow. Injectors were asked to identify
their own likely response in each of the situations described within
the vignettes. It was shown that even among those injectors not report
ing any actual sharing in the last 6 months a significant proportion w
ould still be prepared to share injecting equipment within certain sit
uations. The preparedness to shave injecting equipment was seen to be
influenced by such factors as social distance, sex and length of time
injecting. It is suggested that even in situations where drug injector
s may have modified their behaviour in the direction of lower levels o
f reported sharing, a propensity to share may remain. This suggests th
e continuing need to provide injectors with easy access to sterile inj
ecting equipment; in addition, services working with injecting drug us
ers may need to focus not only upon actual sharing behaviour but also
upon what we have described here as the preparedness to share. Indeed,
the latter dimension should stand as a warning to services of the pot
ential for sharing injecting equipment to increase in the future.